CN1153584A

CN1153584A - Subscriber multiplexer, telephone system and method for communicating condition of subscriber interface

Info

Publication number: CN1153584A
Application number: CN 95194211
Authority: CN
Inventors: 阿托·廷霍恩; 维萨·蒂艾恩
Original assignee: Nokia Telecommunications Oy
Current assignee: Nokia Oyj
Priority date: 1994-06-15
Filing date: 1995-06-14
Publication date: 1997-07-02

Abstract

This invention relates to a subscriber multiplexer (MUX1, MUX2) comprising means for receiving signals transmitted from subscriber interfaces (L1-L30) and feeding said signals further to a telephone exchange (1) via a PCM connection, and means for feeding signals transmitted from the telephone exchange (1) via a PCM connection further to the subscriber interfaces (L1-L30). For detecting the condition of the subscriber interfaces, the subscriber multiplexer (MUX1, MUX2) comprises measuring devices (2) for checking the condition of the subscriber interface (L1-L30) of the subscriber multiplexer, and a control means (3) for activating the measuring devices (2) in response to a measurement request signal (S1) transmitted by the telephone exchange (1) via a PCM connection, and for transmitting a message (V2) describing the measurement result to the telephone exchange. The invention further relates to a telephone system and a method for communicating the condition of a subscriber interface of a subscriber multiplexer.

Description

A kind of user's multiplexer, a telephone system and a kind of method that is used to transmit the user interface state

The present invention relates to a kind of user's multiplexer, it comprises and is used to receive the signal that transmits from user interface, and described signal is connected the device of further passing to switch by PCM; Be used for the signal that transmits from switch by the PCM connection is sent to the device of user interface; And the user interface status detection equipment that is used to check user's multiplexer.The invention further relates to a telephone system, it comprises a telephone exchange, connect the user's multiplexer that links to each other with this telephone exchange by PCM, this multiplexer comprises user interface and checks user interface status detection equipment by the analysis to measure result.The invention further relates to a kind of method that connects the user interface state of the user's multiplexer that links to each other with this telephone exchange by a PCM that transmits to telephone exchange.

Everybody knew in the past that the user interface of user's multiplexer, linked to each other as phone or similar device by a transducer and two-wire circuit and subscriber board.This transducer makes here that subscriber board is electric to be gone up with user's multiplexer adaptively, and finishes the analog-to-digital conversion of necessity.User's multiplexer connects by PCM (pulse code modulation) and leads to telephone exchange, and wherein, each user interface all is assigned with a channel in the PCM connection.The frame structure that PCM between user's multiplexer and the telephone exchange connects is formulated according to the G.704 proposed standard of CCITT (international telegram and the phone committee) in typical case, and the interface between user's multiplexer and telephone exchange is the interface of Q.512 recommending according to CCITT in typical case.

The shortcoming of above-mentioned user's multiplexer is that the state of monitor user interfaces is very difficult, and this is to need on-site maintenance personnel's participation because monitor the state of the circuit that is connected to a user interface.The attendant is connected on an independent service terminal that contains testing equipment on user's multiplexer, and then this attendant detects the state of user terminal, for example, and can be by measuring electric current, voltage and/or insulation resistance.The user interface that will check user's multiplexer like this is very inconvenient, and measuring speed is slow, and cost is high relatively, because it needs an on-site maintenance personnel's participation.

Target of the present invention is to solve problem mentioned above, and a kind of user's multiplexer is provided, and it has simplified the inspection to the user interface state significantly.User's multiplexer among the present invention has been realized above requirement; it is characterized in that including a controller; be used to respond from telephone exchange and connect the test request signal that transmits by described PCM; start testing equipment; and the message of describing test result is first sent to telephone exchange, and all are normal or be out of order for the detected user interface of described message informing telephone exchange.

The invention further relates to a system, wherein can adopt user's multiplexer of the present invention.Of the present invention the system is characterized in that: user's multiplexer comprises a controller, the test request signal that it is used to respond from telephone exchange sends one first message to telephone exchange, and startup testing equipment, also be applicable to when user interface is working properly and send out second message of describing test result to telephone exchange, when user interface is out of order, wait for time limit (time-limit) signal, send one second message then from telephone exchange.

The invention further relates to a kind of method, test result can be sent to telephone exchange from multiplexer by it.Of the present invention the method is characterized in that: come the test request signal of receiving from telephone exchange is approved by send first message to telephone exchange, all are normal, perhaps first-class in telling this user interface of switch that fault is arranged from just sending out second message to telephone exchange after the time limited signal of telephone exchange by send this user interface of switch that second message accuses to telephone exchange.

The present invention is based on such idea: testing equipment is integrated into the inspection that to simplify greatly and to quicken in user's multiplexer the user interface state, use this multiplexer, operating personnel can be from operation maintenance center's automatic inspection user interface of telephone network, and receive and to point out the message of test result, and need not the attendant is sent to user's multiplexer scene.Subscriber board multiplexer of the present invention, the most significant advantage of this system and method is to compare with the prior art scheme, can there be much lower cost, faster speed, easier mode to detect the state of user interface, and can not increase the complexity or the load of the signaling of telephone exchange or user's multiplexer significantly.

In a preferred embodiment of the present invention, according to the CCITT proposed standard G.732 the frame structure that connects the PCM link of telephone exchange and user's multiplexer is, and the interface between telephone exchange and the user's multiplexer is according to a CCITT proposed standard V2 type interface Q.512.In the case, the signaling of the relevant test between telephone exchange and the user's multiplexer can be used individual bit in use fully according to the present invention, promptly, in multi-frame structure corresponding to the bit C of the time slot T16 of user interface to be measured, because this bit does not define special purposes in CCITT suggestion G.732.Like this, the present invention also can be used in the telephone system of prior art by described suggestion.

The execution mode of user's multiplexer of the present invention, system and method proposes among the 6-7 and 9 at appended dependent claims 2-4 under the preferable case.Below, we are described the present invention by the execution mode under the preferable case of the present invention is more detailed with reference to the accompanying drawings.In the accompanying drawing:

Fig. 1 is a frame structure of G.732 advising according to CCITT,

Fig. 2 illustrates a system block diagram of the present invention, and

Fig. 3 illustrates according to test process flow chart of the present invention.

Fig. 1 is a frame structure of G.732 advising according to CCITT.No matter be from telephone exchange to user's multiplexer, still from user's multiplexer to telephone exchange, the frame structure that information all press Fig. 1 transmits.Can see that from Fig. 1 a multi-frame is made up of 16 frames, a frame comprises 32 time slots.And each time slot itself comprises 8 bits.Channel 1 ... information transmitted is placed in time slot 1 in 30 ... 15 and 17 ... in 31.Time slot 0 is used to transmit the synchronizing signal of this frame, time slot 16 order that is used to deliver a letter.

It can also be seen that from Fig. 1 in the time slot 16 of frame 2, the signaling relevant with channel 1 and channel 16 transmits by four bit a-d.According to suggestion, when not having signaling to take described channel, described bit is provided with like this: b=1, c=0 and d=1.Must be noted that several countries are arranged, comprise Finland, when not having signaling to take certain channel, above-mentioned bit is come assignment according to themselves recommended standard.Such as, according to the recommended standard of Finland, described bit value is b=0, c=1 and d=1.The value of bit C is just fully opposite with the CCITT suggestion like this.But, hereinafter the description of this invention is the situation of advising by CCITT.Yet the present invention also can be used for the telephone network of Finland, only needs a bit slight change,, in the example below bit C value is changed into 0 from 1 that is, or on the contrary.

According to the present invention, bit C is used for the state of monitor user ' interface.In other words, if you want to detect the state of the user interface corresponding with PCM channel 1, the bit C that irises out among Fig. 1 is used for the order of delivering a letter between telephone exchange and user's multiplexer.

Fig. 2 illustrates system block diagram of the present invention.Be decorated with a telephone exchange 1 (as, NOKIA D * 210 or D * 220) among Fig. 2, two user's multiplexer MUX1 and MUX2 link to each other with it by terminal LT (line terminal).User's multiplexer and telephone exchange 1 PCM by a 2Mbit/s is connected and links to each other, the frame structure of this connection meets the G.732 suggestion of CCITT, and the frame structure between telephone exchange and the user's multiplexer is the Q.512 digital V2 interface of suggestion that meets CCITT.

Among Fig. 2,30 subscriber boards (telephone set and similar subscriber board) are connected on user's multiplexer MUX1 by interface L1～L30 by two-wire and transducer (not drawing among the figure).Transducer is finished necessary analog-to-digital conversion, and the electrical property of two-wire circuit and user's multiplexer are complementary.Be connected on each subscriber board on the user interface and all be assigned the channel of a fixing 64kbit/s.Correspondingly, telephone set and the another one simulation private branch exchange 5 that is assigned with two interfaces among the user interface L1-L30 that uses user's multiplexer MUX2 all is connected on user's multiplexer MUX2.

When operating personnel thought the operating state of user interface of test example such as user's multiplexer MUX1, he manually started a test period.At this moment, telephone exchange by in the multi-frame with the corresponding T16 time slot of user interface L1 that will measure in bit C set be 1, come to send a test request signal to user's multiplexer MUX1.In other words, used the bit C of the time slot T16 of frame 1 shown in Figure 1 here.Bit C is circled (generally being worth according to CCITT suggestion bit C is 0) among Fig. 1.Variation has taken place in the value that the control unit 3 of user's multiplexer MUX1 detects above-mentioned bit, and it starts a measuring equipment 2 and sends one first message V1 to telephone exchange as a result.Send V1 and also be by in being sent to the frame of telephone exchange multi-frame in the corresponding T16 time slot of user interface L1 to be measured in bit C set be 1 to finish.

After this, the state of testing equipment 2 test subscriber's interface L1, test can be adopted known method, as measuring electric current, voltage and/or the insulation resistance of two-wire circuit, reaches the state that comes test translator with independent test program.Control unit 3 monitors this test process.After test finished, if all normal words of user interface L1 measurement result, control unit 3 sent second message to telephone exchange, and this is to be 0 by the bit C value of putting the time slot T16 of user interface L1 in the corresponding multi-frame structure.But, if test result is pointed out user interface fault is arranged, after control unit just will wait for that telephone exchange is sent a time limited signal S2, just send second message to telephone exchange 1.

After sending out a request for test signal S1, telephone exchange 1 monitors the value of bit C described in the frame of receiving from user's multiplexer.When telephone exchange 1 found that described bit value becomes 1 (the first message V1), it started timer.When timer indicates one period scheduled time when having surpassed, telephone exchange is found test crash, promptly, user interface to be detected has fault (unless it receives one second message V2 before this), so it is set to 0 by described bit, send a time limited signal S2 to user's multiplexer.

Fig. 3 is illustrated in a flow chart of test process in the system of the present invention.When the operator begins test process in square frame A, telephone exchange sends a test request signal S1 (promptly to user's multiplexer among the square frame B, bit C is changed to 1), user's multiplexer confirms to begin test by sending one first message V1 (that is, bit C is changed to 1) to telephone exchange among the square frame C.The measuring equipment that this means user's multiplexer begins test subscriber's interface.After switch is received first message, time started supervision in square frame D.Telephone exchange has received that in advance relevant test will continue information how long.Among the figure E, if this time surpasses, switch will be stated because user interface breaks down and causes test crash, and send a time limited signal S2 (that is, bit C is changed to 0) to user's multiplexer.Among the figure F, user's multiplexer is confirmed this time limited signal with one second message V2, after this EOT in figure G.

But if all are normal for the user interface to be measured of user's multiplexer, user's multiplexer sends one second message V2 (that is, bit C is changed to 0) to telephone exchange, as square frame H.Telephone exchange is confirmed second message by sending time limited signal S2 (that is, bit C is put 0) to user's multiplexer, and as square frame I, after this, EOT is as square frame G.

Like this, just can pass through to be each channel allocation one individual bit, that is, and the bit C among the time slot T16, the state of user interface in switch transmission user multiplexer.The information of receiving at the switch place only points out whether user interface has fault, has only after this when attendant's on-the-spot test user multiplexer and just can know information more accurately.

Should be appreciated that more than description and relevant accompanying drawing are in order to demonstrate the invention.The professional who is proficient in this technology is easy to carry out different changes and modification, and does not depart from the scope and spirit of the present invention described in the appended claims.

Claims

User's multiplexer (MUX1, MUX2), it comprises:

Be used for receiving from user interface (signal of L1～L30), and pass to the device of a subscriber exchange (1) described signal and then by the PCM connection,

Be used for connecting signal of sending from telephone exchange (1) and then the device of passing to user interface (L1-L30) by PCM, and

Be used to detect the user interface (measuring equipment of state (2) of L1～L30) of user's multiplexer; it is characterized in that: user's multiplexer (MUX1; MUX2) comprise control device (3); this control device is used to respond subscriber exchange (1) and connects the signal (S1) of the request for test of sending and start measuring equipment (2) through described PCM; and a message (V2) of describing measurement result sent to telephone exchange, all are normal or break down for described message (2) the notice tested user interface of telephone exchange (1) (L1-L30).
2. the user's multiplexer described in the claim 1, the frame structure that wherein said PCM connects is abideed by G.732 recommended standard of CCITT, and wherein telephone exchange (1) and user's multiplexer (MUX1, MUX2) interface between is the V2 type interface that Q.512 a CCITT advises, it is characterized in that:

Control device (3) comprises and being used at the test request signal (S1) of the time limit of multi-frame structure T16 reception from telephone exchange (1), and send the device of the message (V2) of describing test result to telephone exchange in the time slot T16 of this multi-frame structure.
3. the user's multiplexer described in the claim 1 or 2 is characterized in that: a subscriber board links to each other with a same user interface of two-wire circuit (L1-L30) by a conversion equipment.
4. the user's multiplexer described in any among the claim 1-3, it is characterized in that: measuring equipment (2) comprises the device that electric current, voltage and/or the insulation resistance to user interface measured.
5. a telephone system comprises

A telephone exchange (1), and

User's multiplexer (MUX1 that links to each other with telephone exchange by the PCM connection, MUX2), this multiplexer comprise user interface (L1～L30) and be used for checking the measuring equipment (2) of user interface (L1-L30) state by the analysis to measure result, it is characterized in that: this user's multiplexer comprises:

A control device (3), it is applicable to the measurement request signal (S1) that response telephone exchange (1) is sent, one first message (V1) is sent to telephone exchange (1), and startup measuring equipment (2), also be applicable under all normal situations of user interface (L1-L30), send second message (V2) of describing measurement result to telephone exchange, under the situation that user interface (L1-L30) breaks down, wait is sent second message (V2) after receiving a time limited signal (2) of sending from telephone exchange (1).
6. the system described in the claim 5, wherein, the frame structure that PCM connects is abideed by the CCITTG.732 recommended standard, and wherein telephone exchange (1) and user's multiplexer (MUX1, MUX2) interface is to abide by the V2 type interface that Q.512 CCITT advises between, it is characterized in that: the time slot T16 that telephone exchange (1) is applicable at multi-frame structure sends out to control device and measures request signal (S1) and time limited signal (S2), the time slot T16 that user's multiplexer control device (3) is applicable at multi-frame structure to telephone exchange (1) send out first and second message (V1, V2).
7. the system described in the claim 5 or 6, it is characterized in that: telephone exchange (1) comprises and being used in the scheduled time that sends after measuring request signal (S1), if do not receive second message (V2), then to user's multiplexer (MUX1, MUX2) device of transmission time limited signal (S2).
8. method, be used for to telephone exchange transmit those by a PCM connect user's multiplexers of linking to each other with telephone exchange (1) (MUX1, the state of user interface MUX2) (L1-L30) is characterized in that:

By the measurement request signal of confirming to telephone exchange (1) one first message of transmission (V1) to receive (S1) from telephone exchange (1), and

All are normal to represent user interface by sending one second message (V2) to telephone exchange, perhaps just represent that to telephone exchange (1) transmission second message user interface (L1-L30) has fault by the time limited signal (S2) of receiving that comes from telephone exchange (1).
9. the method described in the claim 8, wherein, the frame structure that PCM connects is according to CCITT recommended standard G.732, and wherein telephone exchange (1) and user's multiplexer (MUX1, MUX2) interface between is the V2 type interface of Q.512 advising according to CCITT, it is characterized in that: telephone exchange (1) is applicable to by being 1 to transmit and measure request signal (S1) with the bit C set of the corresponding time slot T16 of user interface to be measured in the multi-frame structure, being put 1 with the bit C of the corresponding time slot T16 of user interface to be measured in the multi-frame structure is used for transmitting first message (V1) to telephone exchange (1), put 0 with the bit C of the corresponding time slot T16 of user interface to be measured in the multi-frame structure and be used for transmitting second message (V2) to telephone exchange (1), telephone exchange (1) is applicable to by transmitting time limited signal (S2) putting 0 with the bit C of the corresponding time slot T16 of user interface to be measured in the multi-frame structure.